Rubber Dust Cap Covers for ST Mating Sleeve/ST Adapter, 100pcs/pack are designed to protect unused ST fiber optic ports from dust, dirt, and moisture. Made from flexible and durable rubber, these dust caps fit securely on ST mating sleeves and ST adapters, ensuring clean and secure port protection during storage, transport, or maintenance. Ideal for telecom, lab, and network environments, this 100-piece bulk pack is perfect for large-scale deployment or routine upkeep. An essential accessory to help maintain system performance and optical integrity.